In addition to all that I much prefer the FC on-screen display on that version, it looks better than the basic NES one. And in addition to the title-screen animation, the FC version has a full ending! On the NES all you get is a single static screen, but not so on the FC.
So yeah, Famicom Salamander has:
- A title screen animation
- An actual full ending, not just a single "Congrats" screen
- A better-looking in-game bottom bar
- Two options instead of only one
- A cool transparent cartridge
As for how to play it, I use a NES with cartridge converter. The game doesn't have any problem running that way.
I much prefer the Gradius powerup system of the NES/FC version over the "just collect powerups" system of the original Salamander for arcades (and also PCE), so the NES version or arcade Life Force, which use Gradius-style powerups, are better in my opinion. It's too bad that the PCE/TG16 version doesn't have a Gradius powerups option, that'd have made it better...